Joan Comadran

AI Engineering

Hire an AI engineer for LLM products & agents

I ship production LLM systems — agents with MCP, end-to-end AI products, and paid acquisition with tracking that recovers ROAS. Barcelona-based, remote-friendly, founder-mode when you need it.

Offer

What I take on.

  • 01

    AI agents & MCP

    Production agents that call real tools — WhatsApp, CRMs, calendars, internal APIs — via Model Context Protocol and LLM tool use. Multi-tenant where it matters, BYOK when cost control matters more.

  • 02

    LLM products end-to-end

    From brief to shipped SaaS: Next.js, TypeScript, Supabase, auth, billing hooks, and model pipelines that survive contact with real users — not demos that die in a notebook.

  • 03

    Paid acquisition + tracking

    Google and Meta campaigns with measurement that still works post-iOS14: GA4, GTM, server-side tracking, and dashboards so spend maps to outcomes instead of vibes.

Proof

Shipped, not hypothetical.

All projects →

How I work

Stack & timeline.

Default stack

  • TypeScript
  • Next.js
  • React
  • Node.js
  • Python
  • Supabase
  • Claude / Anthropic
  • OpenAI
  • MCP
  • WhatsApp Cloud API
  • GA4 / GTM
  • Google Ads
  • Meta Ads

Flexible when the client stack requires it (PHP, WordPress, existing backends). The constant is shipping something users can touch.

  1. Week 0–1

    Scope & stack

    Clarify the outcome, constraints, and success metrics. Pick the smallest stack that can ship — usually TypeScript / Next.js plus the model and tools you already trust.

  2. Week 1–3

    Build the spine

    Core flows first: auth, data model, the agent or LLM path, and one happy-path integration. You get something clickable early, not a wall of slides.

  3. Week 3–5

    Harden & instrument

    Edge cases, observability, cost controls, and tracking. If growth is in scope, wire campaigns and attribution before scaling spend.

  4. Ongoing

    Ship & iterate

    Launch, watch real usage, then tighten prompts, tools, and funnels. I stay close through the first production weeks so nothing drifts.

FAQ

Quick answers.

Who is a good fit to hire you as an AI engineer?
Founders and teams that need an LLM product or agent shipped end-to-end — not just a prototype. Ideal when product, engineering, and (optionally) paid acquisition need to move together.
Do you build MCP and production AI agents?
Yes. Agents with tool use, WhatsApp and API integrations, multi-tenant setups, and Model Context Protocol where it fits. The bar is production use, not a weekend demo.
What does a typical engagement look like?
A clear outcome, a short discovery week, then build in 3–5 week slices with something usable early. Stack defaults to TypeScript, Next.js, and Claude or OpenAI unless your system requires otherwise.
Are you available remotely from Barcelona?
Yes. Based in Barcelona and hybrid/remote-friendly. Collaboration works over email, LinkedIn, and the usual async tools.

Get in touch

Let’s ship the agent — or the product.

Tell me what you want live in the next few weeks. AI engineering, full-stack LLM products, paid acquisition rebuilds — if it’s interesting to build, I’m in.